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Old 05-12-2006, 01:47 AM   #1
74Chevy74
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ZZ3 vs. ZZ4

What's the difference? From what I can find online they are basically the same, within 5 HP and the ZZ4 is just newer with a few differences? Anyone? I have a chance to buy a ZZ3 for a real good price.....so I'm trying to get some info.
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Old 05-14-2006, 05:31 PM   #2
jimfulco
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Re: ZZ3 vs. ZZ4

ZZ4 uses LT4 valve springs/retainers & powdered-metal rods, while the ZZ3 used an older-design damped valve spring and forged "pink" rods. The pistons are a little different, but I think it's only in weight. Both use flat-tops, and they both have the same camshaft. Get it before it goes away.
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Old 05-15-2006, 12:57 AM   #3
79BIG10
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Re: ZZ3 vs. ZZ4

I've got a ZZ4 and love it. Can't beat them and if you can get a ZZ3 for a good price I would get it!
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Old 05-16-2006, 08:53 AM   #4
87 STEPPER
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Arrow Re: ZZ3 vs. ZZ4

The main differance in the two is the zz3 has steel heads and the zz4 has aluminum heads.
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